mail01.wxs.nl has no MX records.
Question and response
Question
dig mail01.wxs.nl. MX
Answer
The response has no answer records.
Authority
wxs.nl. 3600 SOA ns13.kpn.net. zonemaster.kpn.com. 2025112602 3600 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0